why not get one of these http://www.amazon.com/Havahart-5265-.../dp/B000BO71NY a friend of mine has a shallow pond with some koi that would always get snagged by kranes or coons this keeps everything out just remember to shut it off when your near it cause everyone forgets ;p.

better than when they had rabies out here a few years back all the coons would wander around in the day time all geeked out thats about the only time i actually stayed away from them 10+ ft other than that there just very intelegent animals that love to use there hands and get into everything.